How to retract rear left seat belt on 2007 toyota camry

SOURCE: 99 Toyota Camry one of the rear seat belts won't retract

You have to actually unbolt the belt holder behind the seat. Then from there you can check to see if the spring still works. You'll probably have to take the cap off it, wind the spring-load, then put the cap back on. If you can get to it, it's not too difficult. I recommend another pair of hands to help hold if they're available. You'll also want to make sure you've rolled the belt up as much as possible before before you coil the spring-load.

SOURCE: 1991 Toyota Camry Automatic seatbelt harness

http://www.toyotanation.com/forum/showthread.php?t=300887
Full version about Automatic Seatbelt troubleshooting for 87-91 Camry written by Professor Oleg Turkin

SOURCE: I have a 98 Toyota Camry and the left rear seat

The belt will need to be replaced. never try to fix a seatbelt due to safety reasons. you can get complete belt from a salvage yard. just remove the bolt that secures it to the vehicle.
Be sure to tighten the new one down so it is good and tight.

SOURCE: Replacing a rear seat belt in a 1998 Toyota Camry

if its centre belt remove rear seat to undo bolt out side one remove cover on upper belt to expose bolt

SOURCE: how to change serpentine belt on 207 toyota camry

4 cylinder diagram
6 cylinder diagram
Loosen the tensioner pulley to remove the belt. It is the one that has a long bolt running through it. Once you remove the old belt, install the new one using the appropriate diagram from the above two links. Readjust the tension using the bolt you loosened to remove the old belt.

i hope this helps
matthew